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erc20.sol
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erc20.sol
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pragma solidity ^0.5.0;
contract FuncToken {
uint public totalSupply;
//string public constant symbol = “FUNC”;
//string public constant name = “Func Token”;
address public initial_owner;
mapping (address => uint256) private balances;
mapping (address => mapping (address => uint256)) private allowances;
// uint256 private totalSupply; //How many decimals to show.
constructor(uint supplyStart) public {
totalSupply = supplyStart;
balances[msg.sender] = totalSupply; // Give the creator all initial tokens
initial_owner = msg.sender;
}
event Transfer(address _from, address _to, uint256 _value);
event Approval(address _from,address _to, uint256 _value);
function transfer(address _to, uint256 _value) public returns (bool success) {
require(balances[msg.sender] >= _value);
balances[msg.sender] -= _value;
balances[_to] += _value;
emit Transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
uint256 allowance = allowances[_from][msg.sender];
require(balances[_from] >= _value && allowance >= _value);
balances[_to] += _value;
balances[_from] -= _value;
if (allowance < 10000) { //max_value allowed
allowances[_from][msg.sender] -= _value;
}
emit Transfer(_from, _to, _value); //solhint-disable-line indent, no-unused-vars
return true;
}
function GivingSGP(address _to, uint256 _value) public returns (bool success){
require(balances[initial_owner] >= _value, "Not enough tokens in circulation");
balances[_to] += _value;
balances[initial_owner] -= _value;
emit Transfer(initial_owner, _to, _value);
return true;
}
function AddingSupply(uint256 _value) public returns (bool success){
balances[initial_owner] += _value;
return true;
}
function balanceOf(address _owner) public view returns (uint256 balance) {
return balances[_owner];
}
function approve(address _spender, uint256 _value) public returns (bool success) {
allowances[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value); //solhint-disable-line indent, no-unused-vars
return true;
}
function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
return allowances[_owner][_spender];
}
}
// https://blog.eduonix.com/web-programming-tutorials/create-erc-20-token-ethereum-solidity/